SOLUTION NAVIGATOREngineering conditions
For “Cracking and intermittent opens in fine-line RDL after thermal cycling”, add details that may change the assessment order and check the basis and limits of each candidate.
Engineering conditions
Confirm localizable electrical and layout repeatability before stackup simulation. Leave unknowns unconfirmed; general RDL risks do not establish cracks in this sample.
Live assessment
Complete the thermal-cycle electrical timeline and net-to-layout mapping first.
Unconfirmed: Are resistance or continuity logs available at sufficient sampling rates and aligned to the thermal-cycle timeline?; Can abnormal nets be mapped to consistent RDL layers, vias, bends, or die / mold boundaries?Complete location correlations, RDL geometry, and material curves before local modeling.
Unconfirmed: Can abnormal nets be mapped to consistent RDL layers, vias, bends, or die / mold boundaries?; Are actual RDL geometry, layer thicknesses, and temperature-dependent thermomechanical properties complete?candidate solutions
The order changes only with conditions you confirm. Public information cannot establish suitability for your actual samples.
After dynamic electrical and location correlation, select the main pattern. Repeatability and model inputs guide next steps; temporal or spatial overlap does not prove crack causation.
Open temperature ranges, cycle counts, and layout locations narrow sampling and models. They cannot independently prove RDL Cu lines, dielectrics, vias, or package boundaries caused the issue.
Based on reported conditions and public sources. Ready to assess does not establish sample applicability or root cause. Order does not identify the best solution.
Complete the thermal-cycle electrical timeline and net-to-layout mapping first.
Complete location correlations, RDL geometry, and material curves before local modeling.
No result provided. Clarify key conditions before arranging an assessment.
ASE · Fine-Line RDL Structure Analysis of Fan-Out Chip-on-Substrate Platform ↗Results depend on a specific FOCoS structure and simulation setup. They do not prove sample cracks or provide lifetime directly.
ASE · Failure Analysis Lab ↗The capability list guarantees no resolution, success rate, or method combination for this fine-line RDL.
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Related solutions
ASE
ASE lists electrical testing, TDR / OBIRCH / thermal lock-in localization, then sections, FIB, and SEM, supporting a locate-before-destruction workflow candidate.
Basis: ASE：Failure Analysis LabThe reviewed public information describes a workflow. It has not been linked to a specific product in the BLNKK solution catalogue.
ASE
ASE research calibrates 3D models with measurements and compares RDL layer count, carriers, and structure effects on warpage and stress, informing relative comparisons.
Basis: ASE：Fine-Line RDL Structure Analysis of FOCoS PlatformThe reviewed public information describes a workflow. It has not been linked to a specific product in the BLNKK solution catalogue.
Fraunhofer IZM
Fraunhofer IZM reports mechanical stress from expansion differences where fine Cu RDL crosses substrates and studies plated Cu by microtensile testing, informing material-data requirements.
Basis: Fraunhofer IZM：Reliability Investigation of Ultra Fine Line, Multi-Layer Copper RoutingThe reviewed public information describes a workflow. It has not been linked to a specific product in the BLNKK solution catalogue.
Keysight Technologies
Compare via resistance on electrically accessible test structures.
Basis: Keysight's resistance page lists B2902C; the B2900C/CL guide explains Kelvin connections, lead error and resistance compensation.Sumitomo Bakelite
RDL thermal-open comparisons need traceable dielectric materials and actual film-processing conditions to assess material/interface contributions.
Basis: The named RDL subsection describes resolution, UBM adhesion and solvent resistance; these properties do not qualify the actual package for thermal cycling.Toho Technology
RDL thermomechanical models need actual film thicknesses rather than nominal stacks alone.
Basis: The actual two-page specification describes models, objectives and configurations; the current directory still lists TohoSpec3100.Shin-Etsu MicroSi
Compare permanent RDL dielectric/interface conditions when assessing thermal-cycling open risks.
Basis: The current catalog lists SINR; a SPIE 2006 study documents named SINR3150HSM processing.Rigaku
Use accessible crystalline RDL metal-film stress/texture evidence to inform a thermomechanical model; maintain pairing with electrical open localization.
Basis: XRD 2001, dated July 2026, uses SmartLab SE, HyPix-400 and χφ for texture-aware Au stress estimation.Synopsys
Model interconnect process-history stress as part of a localized RDL open investigation with appropriate packaging geometry/process support.
Basis: The current page and 2025 brochure document full stress history/global-local submodeling. A 2011 newsletter demonstrates cyclic solder viscoplasticity.TOPPAN
The defined interposer architecture provides a low-CTE reinforcement alternative for thermal RDL-strain comparison; it is not repair for an existing open.
Basis: The supplier publishes T-RECS structure/targets and describes CTE approximately 45% below conventional packaging substrates. The complete comparison/test basis is not specified, so this does not establish warp or crack improvement in a customer package.Advantest
Distance-to-fault TDR can narrow a thermally induced open along an electrically accessible route; preserve the fault and deembed fixture responses before physical follow-up.
Basis: The current discontinued list and its November 2023 catalog mark TS9001 as sales ended. The catalog specifies <5 µm fault-area resolution over 0–800 ps and 30 seconds per point for 1,024 averages, excluding probe touchdown. These are not universal location accuracy or total test time.FUJIFILM Electronic Materials
Measured properties of selected RDL dielectric support thermomechanical comparisons against continuity changes.
Basis: The page and three technical sheets marked ©2023 document grades, processing windows and cure-dependent typical properties. They do not qualify customer-stack warpage or continuity.References
Research calibrates FOCoS 3D models with measurements and reports correlations between increasing RDL layers, wafer warpage, and specific RDL stresses.
Limit: Results depend on a specific FOCoS structure and simulation setup. They do not prove sample cracks or provide lifetime directly.The official page lists electrical tests, TDR, OBIRCH, thermal lock-in, X-ray, SAT, sections, FIB, and SEM localization / physical analysis.
Limit: The capability list guarantees no resolution, success rate, or method combination for this fine-line RDL.The institutional abstract describes expansion-mismatch stress in fine multilayer Cu RDL crossing different substrates and investigates plated-Cu mechanical properties.
Limit: The abstract is not this case's material test and provides no directly applicable failure threshold.Keysight's resistance page lists B2902C; the B2900C/CL guide explains Kelvin connections, lead error and resistance compensation.
Limit: Scope and limitations Four-wire sensing does not isolate a buried contact without separate terminals. Fixtures and settings affect accuracy; capture of every transient open is not guaranteed. What to prepare BLNKK suggests structure and terminal drawings, expected resistance, allowable test current, temperature conditions and repeated measurements. Confirm with the supplier Confirm Kelvin fixtures, current/integration settings, thermal-EMF compensation, system uncertainty and time resolution.The named RDL subsection describes resolution, UBM adhesion and solvent resistance; these properties do not qualify the actual package for thermal cycling.
Limit: Scope and limitations Material selection cannot locate or repair existing opens. General properties do not replace stress, adhesion and electrical validation of actual films/interfaces. What to prepare BLNKK suggests documenting grades, UBM, films, patterns, exposure/development and curing, with before/after cycling open-location, interface and electrical evidence. Confirm with the supplier Confirm grades, processing windows, temperature-dependent properties, interface compatibility and applicable reliability-test conditions/results.The actual two-page specification describes models, objectives and configurations; the current directory still lists TohoSpec3100.
Limit: Scope and limitations Standard, thick-film and optional-objective specifications differ; oxide-on-silicon ranges do not apply to all materials. Thickness analysis does not directly measure stress or electrical opens. What to prepare BLNKK suggests preparing layer order, materials, nominal thicknesses, optical constants, accessible sites and reference thickness/section data. Confirm with the supplier Confirm current configuration/availability, objective/spot, identifiable layer count and fitting model; discuss repeatability and uncertainty for actual stacks.The current catalog lists SINR; a SPIE 2006 study documents named SINR3150HSM processing.
Limit: Scope and limitations Historical grade/process results do not qualify all current SINR or prove prevention of thermal opens or repair of cracked RDL. What to prepare BLNKK suggests preparing grade, cure history, modulus/CTE, shrinkage, moisture and adhesion data alongside stack/electrical controls. Confirm with the supplier Confirm current-grade data, pattern/cure conditions, metal compatibility and representative-stack cycling/interface validation.XRD 2001, dated July 2026, uses SmartLab SE, HyPix-400 and χφ for texture-aware Au stress estimation.
Limit: Scope and limitations The example does not validate every film/region. Signals, texture, sampling and elastic assumptions affect interpretation; lattice stress is not package warpage. What to prepare BLNKK suggests supplying film/thickness, substrate, process history, region, texture and comparison samples/shape data. Confirm with the supplier Confirm optics/attachments, diffraction planes, method, sampling scale, elastic data, stress assumptions and uncertainty.The current page and 2025 brochure document full stress history/global-local submodeling. A 2011 newsletter demonstrates cyclic solder viscoplasticity.
Limit: Scope and limitations The historical example has specific geometry/material assumptions. Failure/lifetime estimates need calibrated models, not direct transfer to other products. What to prepare BLNKK suggests preparing layout/geometry, materials/interfaces, process sequence/temperature, loads, locations and calibration data. Confirm with the supplier Confirm current versions and model licenses, process-stress and global-to-local transfer methods, parameter calibration, and how lifetime estimates should be compared with tests.The supplier publishes T-RECS structure/targets and describes CTE approximately 45% below conventional packaging substrates. The complete comparison/test basis is not specified, so this does not establish warp or crack improvement in a customer package.
Limit: Scope and limitations Published architecture/development targets are not production design rules or reliability qualifications. Low CTE and electrical testing alone do not guarantee low package warp, crack-free operation or assembly yield. What to prepare BLNKK recommends preparing die layout, I/O/bandwidth needs, substrate/interposer geometry, RDL/TMV requirements and assembly thermal histories. Include existing crack, warp and electrical data to compare architectures and validation plans. Confirm with the supplier Confirm sampling/co-development status, current dimensions/design rules, CTE temperature/reference conditions and electrical-test coverage. Discuss assembly and moisture/thermal-cycle qualification, distinguishing targets from available specifications.The current discontinued list and its November 2023 catalog mark TS9001 as sales ended. The catalog specifies <5 µm fault-area resolution over 0–800 ps and 30 seconds per point for 1,024 averages, excluding probe touchdown. These are not universal location accuracy or total test time.
Limit: Scope and limitations Sales have ended; new supply and support cannot be assumed. Requires an electrically accessible network and suitable reference; resolution is not universal location accuracy. What to prepare BLNKK suggests failed/good samples, routing geometry/dielectric data, probe access and failure conditions to preserve. Confirm with the supplier Confirm maintenance, calibration, probe/software compatibility and available follow-up analysis or alternative services.The page and three technical sheets marked ©2023 document grades, processing windows and cure-dependent typical properties. They do not qualify customer-stack warpage or continuity.
Limit: Scope and limitations Cure ranges, film thickness and exposure methods vary by grade; typical properties depend on curing. NMP-free does not mean solvent-free development or guaranteed warpage/open prevention. What to prepare BLNKK recommends preparing grade, film/metal stack, pattern/vias and exposure/development/thermal history. Include material, adhesion, moisture and thermal-cycle continuity data for validation planning. Confirm with the supplier Confirm current grade, thickness/lithography windows, developer/rinse and cure time/atmosphere. Request properties and reliability conditions for the selected cure, plus sample availability.Before assessment